#1F33B0#1F33B0

#1F33B0 is a dark, vivid blue. Relative luminance 0.058; OKLCH L 40.3% C 0.197 H 267.9°. Best body text is #FFFFFF at 9.73:1 contrast (WCAG AA passes).

Color values

HEX	#1F33B0
RGB	rgb(31, 51, 176)
HSL	hsl(232, 70%, 41%)
HSV	hsv(232, 82%, 69%)
CMYK	cmyk(82.4%, 71%, 0%, 31%)
CIE-LAB	lab(28.88, 39.25, -67.83)
CIE-LCH	lch(28.88, 78.37, 300.06°)
OKLab	oklab(40.28% -0.0071 -0.1966)
OKLCH	oklch(40.28% 0.197 267.9)
XYZ	xyz(9.5827, 5.7924, 41.6789)
Luminance	0.0579 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Blue With A Hint Of Purple

#533CC6

ΔE00 6.97

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F33B0 #B09C1F

analogous

#1F7BB0 #1F33B0 #531FB0

triadic

#1F33B0 #B01F33 #33B01F

tetradic

#1F33B0 #B01F7B #B09C1F #1FB053

square

#1F33B0 #B01F7B #B09C1F #1FB053

split-complementary

#1F33B0 #B0531F #7BB01F

monochromatic

#0D1548 #16247C #1F33B0 #3149DB #6577E4

Accessibility & contrast

On white

9.73

#1F33B0 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.16

#1F33B0 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F33B0

9.73:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F33B0	#FFFFFF	#000000	##FFFFFF
##1F33B0	1.00	9.73	2.16	9.73
#FFFFFF	9.73	1.00	21.00	1.00
#000000	2.16	21.00	1.00	21.00
##FFFFFF	9.73	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004BB4

Deuteranopia (green-blind)

#003DAE

Tritanopia (blue-blind)

#00566E

Achromatopsia (no color)

#444444

Design tokens & code

CSS

--color: #1f33b0;
/* rgb */ color: rgb(31, 51, 176);
/* oklch */ color: oklch(40.3% 0.197 267.9);

Tailwind

colors: {
  custom: {
    50: '#766bc9',
    500: '#1f33b0',
    950: '#000000',
  },
}

SCSS

$custom: #1f33b0;
$custom-light: #766bc9;
$custom-dark: #000000;

JSON

{
  "hex": "#1f33b0",
  "rgb": {
    "r": 31,
    "g": 51,
    "b": 176
  },
  "hsl": {
    "h": 231.724,
    "s": 70.048,
    "l": 40.588
  },
  "oklch": {
    "l": 0.40284,
    "c": 0.1967,
    "h": 267.9
  },
  "luminance": 0.05794
}

Semantic roles & 50–950 ramp

primary

#1F33B0

secondary

#C9BB62

accent

#D43BED

background

#F8F6FC

surface

#EFEBF8

border

#CAC6D1

text

#0A0613

muted

#7C7A82

Preview Lab

Preview with #1F33B0

Body copy rendered with the generated semantic roles for this colour.

Preview Lab → · Contrast checker → · Palette generator →